"I checked every single burrowing spot"
It is hibernating season coming on strong. The turtle could be dug in anywhere there is marginally diggable soil. Depending on where in the US you are this could be more or less relevant; ours have been indoors for weeks now.
If the fence is such that a raccoon could get the turtle out, the turtle could have gotten out on its own. Are the holes in the mesh large enough to jam the turtle through? Is the top of the enclosure uncovered? If the answer to either of these is 'yes', then the turtle could well have gotten through the mesh or climbed out (they are known to climb a few feet easily, and I don't doubt this at all).
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