I open pro chest and no find item in inventory

Today I opened the chest and this thing fell out, but I had no free slots for it and I melted an unnecessary thing, released the slot for the thing, went back to the open chest and pressed to receive it. Then I decided to look at this thing, but I did not detect it. I already have such a thing in the inventory wanted the second, but it’s not.

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How many inventory slots do you have? I know that if you have many items the game doesn’t detect anymore the latest new items you find (starting from belt and then shoes. You have to look for them manually.

51 slot and manually i dont find item