[Help wanted] GUI sprite sheet modding

I am new to Stardew Valley modding, and for my first time doing it, I decided to try and edit the look of the GUI. However, I can't find a few of the sprites (no idea what they look like in the spaghetti that is the files).

I managed to find and edit the top right interface just fine, but I can't seem to find the hotbar and inventory sprites. I've changed quite a few different boxes in the thought that one of them might be it, but to no avail.

Any help would be greatly appreciated, thank you!~
 

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