Can money orders cashed be traced?
Most of them will be indexed by the company. A written request to them will generally get you basic information if you are the purchaser and have the instrument number as a Reference
Beyond that you may need a lawyer
Edit. Yes. you can take the receipt copy, the number, and call the company as ask them to verify if it has been redeemed. Keep in mind it can take4-8 weeks for proof of this to come thru,.