I am the Chief of Enforcement for Idaho Department of Fish and Game. Please contact us so we can send you a packet of information regarding your question. 208-334-3736
For your reference please review Chapter 6, Title 36, Idaho Code. http://www.legislature.idaho.gov/idstat/Title36/T36.htm
I also recommend reviewing Chapter 5, Title 36, Idaho Code.
Idaho Administrative Code has rules governing the importation, possession, release, sale, or salvage of Wildlife. http://adminrules.idaho.gov/rules/current/13/0110.pdf
300.RECOVERY, POSSESSION AND SALE OF WILDLIFE PARTS.01. Wildlife Legally Killed. a. The possession, sale and purchase of wildlife or parts of wildlife that have been legally killed is lawful except as provided below and as provided in Chapter 5, Title 36, Idaho Code. i. The edible flesh of wildlife classified as big game animals, upland game animals, game birds, migratory birds, or rattlesnakes taken from the wild may not be purchased, bartered or sold. ii. The edible flesh of wildlife classified as game fish or crustacea that are taken from the wild may not be purchased, bartered or sold except as provided in Idaho Code Sections 36-501 and 36-801 through 36-805 and rules promulgated pursuant thereto. iii. The annual sale by holders of a valid Idaho hunting, trapping or combination hunting and fishing license of up to six (6) skins of legally taken rattlesnakes is lawful pursuant to IDAPA 13.01.06, “Classification and Protection of Wildlife,” Subsection 300.02 and Subsection 100.06 of this rule. b. A written statement showing the taker’s name, address, license and tag numbers, date and location of kill, signed by the taker, must be provided to the buyer of any black bear or mountain lion head, hide or parts (except tanned hides finished into rugs or mounts). A copy of the sales statement must be forwarded by the buyer to the Idaho Department of Fish and Game within ten (10) days after such sale. A department CE-50, Statement of Sale/Purchase of Wildlife Parts, may be used in lieu of a sales statement. c. Persons possessing a taxidermist or fur buyer license shall keep a record for two (2) years from the date the wildlife was received for mounting or preservation, furbearers purchased and raw black bear skins, raw mountain lion skins or parts of black bears or mountain lions purchased. Records may be written or retained on media other than paper and must comply with standards set forth in Section 9-328, Idaho Code. Copies of sales statements as per Subsection 300.01.b. satisfy provisions of this rule.