I have replaced this missing box but decided to relocate it in the
Eastern Texas Pineywoods region near the town of Weches in the county
of Houston. The clue web link stays the same. Here is a summary of
the changes you need to make:

Old Region: South Texas Plains
New Region: Eastern Texas Pineywoods

Old Town: San Antonio
New Town: Weches

Old County: Bexar
New County: Houston

Thanks,
Silver Eagle (P21F58X4)