Go directly to Buck rather than to the retailer. Buck's Forever Warranty page sets out its current repair process, and Buck covers defects in materials and workmanship for the life of the knife with parts and labor free of charge. Have the model and a clear photograph of the fault ready.
Warranty administration sits with the maker across essentially every brand we carry. A retailer cannot approve or decline a manufacturer's warranty claim, and routing through one only adds a step.
Buck's Forever Warranty page, linked below, carries the current process and address.
The model name or number, a description of the fault, and a clear photograph. If the problem is intermittent, a short video is more persuasive than a paragraph.
Be straightforward about how it happened. A materials defect and a prying accident look different to someone who repairs knives all day.
Buck repairs free of charge including parts and labor, and replaces with the same or a comparable model where repair is impractical. Its separate sharpening service is a paid service, not warranty work.
Warranty terms are set by the manufacturer and can change. The maker's own warranty page, linked below, is the authority. We repeat what it says; we do not extend it, and a retailer cannot promise coverage a manufacturer has not offered.