You can be charged if the evidence, including but not limited to fingerprints on guns, makes it appear reasonably likely that those were your guns. You do not have to be present to "possess" something if it belonged to you, was under your control, etc. Besides the fingerprints--which could be enough in and of themselves--obviously the testimony of other employees at the shop ("No, those weren't my guns...they belong to John Doe.") could connect you to the guns.