You won't be able to slide paper or card under the whole thing. Just all around it and only so deep as the first 1/4 inch or so. If it's tight, sand it down till you can get a card underneath, then seal with Birchwood Casey Seal and Filler or something similar. I wouldn't worry too much about it unless you pillar and bed it, though. Otherwise, humidity will just make it swell and shrink and play games with you anyhow.
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