What discovery is made in Room 223 at the Flamingo Motel in the novel, Tourist Season?

In Room 223 at the Flamingo Motel, Sparky's clothes are found with the legs of his J. C. Penny suit cut off raggedly, and three empty plastic bottles of Coppertone tanning butter with coconut oil. There is also an empty plastic bag with the name of a souvenir store on it.