Hmm, that thought has crossed my mind.
Not a good thought.
But how to find out, if I even want to find out?
Just give it to the cops when, if they will, knock at your door.
If not, why worry?
It is a good thing to worry, yes.
Because, if you bought a stolen equipment, you are helping the criminals, helping this kind of thing happening.
Imagine a scenario, if no one would bought a stolen piece, for what I will stolen (only If I could make some use)...
But on other hand, it is really hard to know if the deal is right or not.
Here in my country it is very common get your stuff stolen. And if the cops knock your door, you may (MAY) go to the jail, if the price is so incompatible to the market, that you could imagine that is illegal.
In some cases like that, I like to ask to the seller some questions about the item and technical things too. Something like:
'Why are you selling this', or in this particular case, 'This genereator can make a sweep on senoidal waveform'.... somethings like that.
But now, as you already bought, let this tought alone...