Sometimes, people mail boxes without checking them first for spiders. Brown recluses can hide inside these boxes and might make their home wherever the package is opened. However, spider experts have found brown recluses sent through the mail rarely start a new colony in their new home, partly because there are no other brown recluses for them to mate with. Sometimes brown recluses sent through the mail set up colonies in warehouses. However, they do not move very far from their colony, which is usually not well-established in the new place.