I've had 6 so far a little ways into chapter 16. wasn't all that impressed with the first few but just farmed a bee from HH (took like 20 tries, was dozing off late last night and when I saw the orange item fly out of him was instantly wide awake...) and having quite a bit of fun with that at the moment.
its normal... maybe unlucky? i was fortunate to find rapid infinity pistol in a dahl chest right after roland gets taken away, i got the hellfire, the shield from henry, the deliverance, gunerang, that stupid logans gun, minecraft sniper rifle, the bee, whats also cool is that i bought the transformer shield, the leecher and the fastball grenade mod at a vending machine.
i didnt get my first orange loot/drop til level 25. so i was kinda late. it just takes some time and farming if you want. oh and i unequipped my Vault hunters relic after finding out it doesnt work.
sorry for the bad luck tc, im sure you will get one soon! i found one that was in an outhouse that somehow glitched through the floor of the crapper before i could grab it... i think i spent a good half hour trying to glitch through the toilet to get it :/
--- ''You have my ear citizen, please give it back."