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Those exhibits were either designated SBJ after the prefix change from SBJ to DB or there was at one point different items with overlapping SBJ designations.
The moderator changed from SBJ/1 to DB/1 to DRB/1
The scope from SBJ/2 to DB/2 to DRB/2
The box from SBJ/3 to DB/3 to DRB/3
and the last item that I am not positive if it is a box of bullets or not was SBJ/4 to DB/4 to DRB/4
I don't feel like reading all the various statements right now to look for the SBJ/2-4 references but I did bookmark something to prove the telescopic sight was changed to the DRB prefix as well not just the moderator:

I did so to challenge the claim that SBJ/1, DB/1 and DRB/1 were different moderators. The sights went through the same set of changes (as did the other 2 items found by Boutflour) and there was no allegation of there being 3 sights because of this so that shows how dishonest the claim is when it is applied only to the moderator despite the same conditions applying to 4 different items that had a prefix change not just the moderator.