In general, seafood markets...
I assume that any new function is inherently bad until proven otherwise.
Simply not testing also indicates that the item is likely faulty, and someone who genuinely wants to sell a working product would not typically say this.
If you ask if he has obtained a license, and he says he doesn't know, it means he hasn't. Also, don't expect him to obtain one.
They are all pretending to be clueless and supportive.
It's best to buy from someone who has already agreed to cancel the transaction or who promises to do so, and only after they have confirmed their callsign. This will prevent any potential disputes later on.