White Tubular Droppings in New Texas Home Bathrooms: Need More Details

New North Texas home has white, hard, tubular droppings (~1/4 inch, pointed one end, flat other) in bathroom corners. House pre-sprayed for insects.

Diagnostic Questions

Drywood termite pellets (but unlikely in new construction, and usually not in bathrooms)
Certain beetle frass
Insect egg cases
Non-insect debris

Answers to above questions will narrow possibilities. Follow up with details.

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