If you're really worried about it, you can go ahead and dig it up. Sure you'll make it mad, but it'll get over it. ANd it'll eventually dig itself a new burrow and be happy as it was before. In the long run it is probably worth it for you to have peace of mind. Just be careful to not harm it while digging. If you can see it in its burrow, you can try to put a stick behind it and prod it out. Or you can try to trickle some water down the burrow and flush it out. THat's how I get them out of the burrow in the wild. It sometimes works, then you don't destroy the burrow.
By the Way: what book do you have? "The tarantula Keeper's Guide" by Schultz, is the absolute best. It is long, and is a lot to read, but it's easy to read and every singe page is helpful and useful. If you want a more concise book, look for "Tarantulas and Other Arachnids" by Marshal, or "Quick and easy Tarantula Care" by Breene. I highly reccomend all 3, they are the best ones in my book collection, Yes I've read quite a few 
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KJ Vezino
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