To secure my tub I used two straps of sewing velcro I happened to have on hand. There is also the heavy duty paper clip/clamps you could try.
I did see a video on YouTube of someone who drilled/melted holes through the lip and lid of one side of the tub and put zip ties through them. He secured the other side with a sort of lock but maybe you could use a small keychain clip instead. Seemed pretty sturdy to but I haven't tested it.
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