Most male slaves are bought, of those some are returned.
Slave agencies post listings of their inventories online. Most are sold outright. (Slaves of rare beauty are frequently auctioned.)
On seeing a potential slave in the catalog the woman arranges to visit the agency. If she’s still interested after meeting the slave man goes to her home for a test drive. Most often for a single night but a weekend can be arranged.
The slave is either bought or returned. Since women are looking for more than an attractive body slaves are frequently returned after tests. Unless the Mistress has a complaint the slave suffers no punishment for not being bought. Women it is understood look for subtle affinities in their slave men.
All slaves are sold with a minimum ninety day money-back return policy. To be returned during the latter part of the guarantee period can be a very serious issue.
Any complaints the temporary owner had become a part of the slave’s permanent record. This can lower the slave man’s value. This greatly angers the slave dealer.
Returned slaves aren’t beaten. Marks would further reduce the slave’s value. The slave’s life becomes one of isolation with heavy retraining and indoctrination. If the slave proves uneducable its price is cut very low and gotten ridden of as quickly as possible. Often the slave goes into a labor slave herd.