Johnny Kleso wrote:That sounds like a display model to me.

Relax...

I've unpacked my fair share of new espresso grinders and it's not unusual for them to arrive with some coffee grounds from the factory test. Related grinder trivia: Grinders with a doser counter usually arrive with the counter in the low 9900's, presumably so the original owner will have the pleasure of watching it turn to 0000.

Mazzers have a durable multi-coat paint job, making it harder to spot the difference between a lightly used one and factory new.

In terms of performance, even a heavily (ab)used one will equal a brand new one once you've replaced the burrs. For example, lots of online espresso enthusiasts bought the old Starbucks (Tagex) Super Jolly grinders that had been abused more than most. I got one in a group buy and it looked like it had been kicked around a concrete warehouse floor. Even so, of the six we bought, only one arrived DOA. Replacing the bearings and burrs returned it to good-as-new service.

PS: How to evaluate condition of used Mazzer grinder offers some good advice to used grinder shoppers.