Two Moab residents accused of selling ancient tribal artifacts including a scrap of blanket or clothing, a loom component and a stone hoe stolen from public land may plead guilty next week.

Brent Bullock, 62, faces five felony charges. His co-defendant, Tammy Shumway, 40, faces four felonies. They are scheduled to appear at a plea hearing Monday before U.S. District Judge Dale Kimball, court papers say. Bullock and Shumway, previously had been set to go to trial on May 3.

The pair was among two dozen Utah, Colorado and New Mexico residents indicted and arrested in a federal sweep on June 10 following a 2 1/2-year investigation into illegal artifacts-trafficking in the Four Corners region. A total of 26 people have been charged with more than 115 felonies.

A search-warrant affidavit shows that Bullock had multiple conversations about selling artifacts with a confidential source working for the FBI and the U.S. Bureau of Land Management.

Court documents say the source in 2007 paid $2,000 for a scrap of a robe or blanket, $800 for a fire board, $500 for the hoe and $30 for a spindle whorl during a transaction Shumway witnessed. The relics came from public land in Utah.

Bullock also tried to sell the source a set of figurines he said University of Utah experts guessed was 2,000 to 2,500 years old for $8,000, the affidavit says.

Since the raid, two defendants -- James Redd of Blanding and Steven Shrader of Santa Fe, N.M. -- killed themselves. On March 1, the undercover operative key to building the cases -- Ted Gardiner of Salt Lake County -- fatally shot himself.

Redd's wife, Jeanne Redd, and their daughter Jericca Redd in July pleaded guilty. In September, U.S. District Judge Clark Waddoups sentenced them to probation and ordered them to surrender their extensive artifact collection.

Five trials have been set for six defendants in the case in May and June.