So I found out that the supply drops can give you duplicate items. That means that you can buy a supply drop and lets say you get the VMP silencer variant. The next day you can buy another supply drop and it could have the VMP silencer variant in it even though you already unlocked it the day before. This being said, if you do the math, there are:
233 black market attachments for primary weapons
27 black market attachments for secondary weapons
725 black market camos for primary weapons
174 black market camos for secondary weapons
198 black market taunts and gestures for specialists
54 black market heads and bodies for specialists
53 black market decals for emblems
11 black market pre-made emblems
101 black market calling cards

This all totals to 1,576 things you can unlock from the supply drops!!

Now let's say that the supply drops DIDN'T give you duplicate items. This would mean that eventually either type of supply drop would have to give you everything. So even the common supply drop would give all the rare, epic, and legendary items eventually because it would run out of common items to give you. If the common supply drop costs 10 cryptokeys and gives you 3 items, you would have to open 526 supply drops costing you 5260 cryptokeys. If a player is averaging 1.5 cryptokeys per game, it would take that player 3,507 games to unlock all the supply drops necessary. If a player is averaging an 8 minute game, this would take 28,056 minutes of IN GAME playing. not sitting in the main menu or editing classes or in between matches. That's 19 days, 11 hours, 36 minutes of gameplay. if you include all of the time spent sitting around not in a match, you can pretty much triple that number. (I personally have 2 days and 6 hours of in game time but my xbox says I've spent 6 days and 7 hours with the game open on my xbox) Tripling this number would put you at 58 days, 10 hours, and 48 minutes of being on the game. Now mind you, this is IF the game didn't duplicate the items received in the supply drops...... but it does....

I think it is safe to say that it is borderline impossible for 1 player to receive every single item available in the supply drops.

Let me know what you guys think and your opinions regarding the supply drops!!