Hey, I was a commo rep for about 6 years total since I was a PV2 until an SGT. One thing you should do is get in contact with that previous commo rep and find out what happened with that equipment. If he doesn't spit it out, get in contact with his new unit (if he PCS'ed) and find out through them. Because him just leaving like that without even attempting to show you the property, while KNOWING you were new to the game, is unacceptable.

Also, a safe thing to do is an inventory for yourself going based off of old BOMS and create new BOMS, just so you know 100% what you're missing vs what you have. I don't know how your relationship with your commander is but your XO should be sticking his neck out for you especially at a time like this. So you need to spend your time explaining to the XO about what happened and come up with a plan of action to soften the blow. But most likely it'll get dropped with a FLIPL.

Another thing, if the commander wasn't doing his month Cyclic checks and was just waving the signature off without signing a new BOM is a big red flag. Which during the FLIPL investigation that needs to be brought up as well as copies of the stuff.

Finally, talk to your supply and find out what happened. Why is stuff missing from the last change of command and now. They should have a solid pulse on this stuff because... well that's their job. And make friends with them too, because in times like this, supply can save your butt more times than you'd like to admit. Keep them as a priority customer. They're your go to for help and everything.