Actually the saw you bought is a Stihl 044 (ebay item 4316105828). Basically the same as an MS440 just an older model. Doesn't look to be in too bad of shape, but I always ask ebay sellers if they can check compression and if any of the plastic flywheel (if it is plastic) fins are broken off. When you get the saw, take off the front of the muffler and look in to see if the piston or cylinder are scored up.
He also says it was owned by a government agency before he had it. That can usually be OK, because they will have it fixed or serviced when something isn't right. They don't have to pay the bill for fixing you know.
Actually that isn't a bad price, 044's have been going between 250-300 the last couple months, some a little less and some a little more. Wait about a month or two and the prices of saws on ebay will go up. Every fall ebay saw prices goes up quite a bit.
The 044 is a good saw, every bit as good as the 372. One's a Stihl and one's a Husky. Get the saw and use it, enjoy and be safe.
Tom