As someone that tries to buy broken test gear to make videos about fixing them, I would much rather have something which hasn't been worked on before, or recapped, as it only raises questions about potential errors being made by the refurbisher.
Also as you intend to sell the units, recapping is going to eat into your profit big time, so unless something is actually having problems working, I recommend you leave them alone.
This is a bit hypocritical of me, as I do the exact opposite for the items I buy and may then sell on once fixed if it is not something I actually need, as I will re-cap them even if the caps test OK, just to be sure, but I do it for the video content and I usually expect to make nothing or maybe even a loss when selling the items on because of the cost to replace dozens of caps, often axial types, which cost a lot more.