A good square block of hardwood with sticky-backed sandpaper* or regular sandpaper fixed with double-sided tape to one side of the block.I'll have to try to find a good way to sand those edges evenly without affecting the floor of the pocket.
That way you can use the bottom of the pocket as a "guide" but not sand it.
I have a few different sized Tassie Oak off-cuts that I use for various sanding jobs. I cut them on a table saw so they're as square possible.
edit to add:
*You can also make your own sticky-backed sand paper by using a contact adhesive spray. Just spray the back of the paper only, not the block. You can the spray at most hardware, electronics or craft stores.
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