The pics show a little oil seepage at the shaft. Check that level is decent. If the shaft is wet it's possible its been run too low (unusual). Overall the machine looks like it's had an easy life. Little wear showing on impeller and auger. The chain is rusty but they are cheap and easy to replace. Hyd chute turner and deflector are nice to have - deflector is great when the snow needs to go somewhere specific.
Can the L45's swing circuit power another valve when BH is removed (like the L48)?
I used to have an AgroTrend a lot like that one (without the nice hydraulic chute). It was a great blower. The only thing that concerns me is the shaft for the auger drive is sticking out past the bearing quite a bit, it may be nothing but a loose coupling, but I'd want to check that out before spending $$. Other than that it looks like its in great shape.
How much were they asking for it?