Here's my opinion. I've done this with a coffee table but never a humidor. The coffee table was a little less refined than your average humidor but it should work fine.
If you really want to make it look like new is get a couple of sheets of really fine sand paper. Get some paper, starting at around 400 grit wet/dry, but do it dry, and slowly sand the entire top, brining the total top layer down to the bottom of the scratch. Then clean with a tack cloth, then to the entire top again with 600 grit wet/dry. Do it dry again, if you do it wet the water could seep into the lower layers of poly.
This time remove any particles with a compressed air, you can get a can of it at a computer store for cleaning keyboards and such, then get use a real high quality poly, make sure when you buy it you tell them it's for furniture and not floors and put on a layer, let dry for however many hours the can says and assess. Most likely you should hit it with another coat, but don’t sand it this time.
Edit - I search and found a place to order the 600 3M paper, I didn't look but they probably have the 400 also.
http://hobbypeople.net/gallery/507467.asp
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