The unpolished metal is standard for Intel SSDs. Intel concentrates on the quality of the drives, not the visual appearance of the metal. You will need to find a non-Intel SSD if you like your products to be visually perfect.
As for the fingerprint, it's not unusual on high-end electronics. I would have expected staff to wear gloves, but it's not a big deal if they don't, which could cause fingerprints.
Don't worry about it. Check the powered-on hours value with a SMART application if you're still worried that it has been used for a while.
Would you be able to post pictures of the drive in question?
Also, would you also post a screenshot of the SMART values? There should be a value for the number of times it powered on and how many GBs have been written to it. Non-zero values for these is normal but a very high value indicates prior use.