Should arrive this week.
Has arrived... 
You skipped the most interesting part of the certificate: the bottom. But let's look at my case.
I bought my DMMCheckplus long time ago from Doug. And sent it back for calibration several times.
But then at some point I wanted to get an L/C-board. So I decided to give the new brand owner a try and sent my device for recalibration and adding a new board.
Here you can compare the two calibration reports that I got: the previous one from Doug and the new one from the new brand owner.

First, the new report lacks the "as received" measurements.
All the previous reports showed slight drift of the DC reference value. Now it is simply missing the significant digit.
I asked the new owner whether they did any adjustments and they said they did. Which means the history is already lost too.
The damage was done.
The new cert even has a funny "DCV temperature coefficient" measured +6uV/F but the value measured was specified to the hundreds of microvolts! Was it a joke?
Looking further, many (most?) of the values lost at least one significant digit. Starting from AC voltage and current.
My AC current has not drifted a single 10^-4 for several years, but now they simply specified it to 10^-3.
From the previous calibrations I know that my 1kOhm resistor used to drift for 0.01ohm annually (1.00023k, next year 1.00024k) but there is no that last digit anymore.
Low and high oscillator duty cycle was never the same for me. They are suspiciously equal in the new report. And one digit is lost.
So I feel that the new cert is basically saying "in specs" and does not give any more details. Which is a very different product from what Doug created.
The attention to details is what built trust in this product. Now it is different. And I feel that the new owners are basically reusing old product reviews (see the happy Doug customers above).
I would not apply Doug's reputation to the new product. It's not what it used to be.
But why dream of what was gone? New age, new trust, new products! Don't be the old guy!
Let's look at the new product built by these guys. The L/C board.
https://dmmcheckplus.com/shop/ols/products/lc-board still says:
giving you .001, .01, .1 and 1 uF reference capacitors AND .001, .01, .1 and 1 mH inductors, all tested to within .05% of their value.
Great! 0.05% is a pretty high margin. What did they use to measure it? BK 891.
It's a nice meter, but 0.05% is the very best accuracy it can provide. BK Precision even makes a special "LCR Accuracy Calculator" software to calculate the actual measurement accuracy.
Page 6 of the datasheet
https://bkpmedia.s3.us-west-1.amazonaws.com/downloads/datasheets/en-us/891_datasheet.pdf specifies the basic accuracy, but the user manual has the actual formulas and their software is capable of calculating the actual accuracy.
For example, if I read this chart correctly the basic accuracy for a 1uF capacitor measured at 10kHz with this meter is on the edge between 0.5% and 1%.
So it was worth asking about the measurement accuracy of their setup, wasn't it?
And... they replied me with the chart above. Saying that "BK lays it out on this chart". And attached the chart. That was it.
Which basically means they do not have more data and probably never paid attention to.
To sum it all up: I think it's unfair to reference Doug work on this product anymore. The attention to details and confidence was the product that Doug built. (And hopefully he is still doing good with his voltagestandard references!)
The schematics is not complicated, you can easily build one yourself. You can even measure it with some random calibrated meter, but it won't get you the Doug experience and passion.