RAM chips will always power on to some state, not all zero or one ( that is the default for EPROM and EEPROM, as they are erased during manufacture as part of the testing for QC), and the actual state of each cell will vary, though you will get blocks that power on to a particular value or just random values.
The NVRAM chips as manufactured have a non resettable freshness bit in there, that is set to power off the internal RAM until the first power up of the unit in use, which then enables the on board supply to the memory, and this is then only reset when the battery is totally flat again. This is to give the best storage life, as then the minute drain from the RAM chip is not applied to the coin cell there.
If it has valid data ( readable strings of data in locations, increasing numbers in a sequence) then it probably was a chip that had full QC done on it in test, or a return, though if it was still in the original unopened pack it would be hard to see if it was a return.