[Scoundreller]

> The housing was difficult to open: its two halves were held together with liberal quantities of glue and double-sided adhesive tape instead of the ultrasonic bonding used on factory-made Trezors.

Other than having x-ray vision, one easy (but by no means perfect) verification to thwart these types of attacks is to weigh your devices.

Manufacturing should be consistent enough that resealing a device like this would be adding some grams that shouldn’t be there. And unlike something like a cisco router, nothing to cut out to make up for the added weight.

[alden5]

the problem is the sorta person to buy a wallet from a classifieds website isn't willing to spend $30 on a scale to weigh it, because if they had that money they'd just buy it from the official store instead

[Scoundreller]

Lifehack: a post office will weigh whatever you want for free. Also many grocery stores have accessible scales.

Best part is they pay for the certifications!

Then there are friends that ahem buy/sell materials in gram quantities. A counted handful of newish coins are a reasonable way of verifying accuracy in those cases. Be sure to weigh different quantities lest the absolute and relative error cancel out.

[Alupis]

The Post Office's scale likely only has ounce resolution, or at best, 0.01 LBS (0.16oz) resolution. ie, you won't notice a couple grams of glue...

[ibz]

Indeed, you need a drug dealer's scale!

[Scoundreller]

A jeweller’s scale!

[Scoundreller]

Ah, they’re all grams here, but that still might not be enough precision on a small device.