Not all of those clear plastic ones are created equally. Took me a while to find a size that would fit a deck perfectly. I settled on these: https://www.amazon.de/dp/B0CKNBCGDB
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(Amazon.de but I'm sure you could track down the same ones on the .com)
They will fit a deck of poker sized, and will even fit most tuck boxes snugly.
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Oh, also... You might want to look for boxes with fairly sharp inside corners. As a very rounded box might knock into the corners of your more sharp edged card decks.
Yup, all this and thanks for the input.Hm, aren't those the same ones as the TEMU's that OP tried?
What @Phyffe suggested might or may not be the same that I've ordered, product page is no longer available, but I can confirm, not all plastic boxes are created equal.
Ever so slightly too small for poker size:
Fits bridge size like a glove though: