You shouldn't really have to check anything. If it's somehow defective you can certainly exchange it.
I can personally attest to the fact that my topfin tanks have aqueon trim, lids, warning stickers, and lights.
I own 2 topfin 75g tanks. The silicone is a bit sloppy, but its adequate. The panes of glass don't line up 100% perfectly. My 90g aqueon tank is far superior visually speaking, the panes line up beautifully and the beads are nearly flawless. . but thats the difference in price.
To be honest I wouldn't put much consideration into buying smaller tanks under 40g
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