Tune, I think you were right. The Original seller was left a negative for backing out on the $500 sale. He probably left a 0 off the original listing and it came out as $500 instead of $5000. He obviously has multiple eBay accounts.
Yes , it appears to be same seller or a family/friend from same town listing it now. The 2nd knife has K.L. initial and assuming he did not engrave/punch that on to the blade in last few days .... both knives belonged at one time to the same person .
Seller might have mixed up the knives and values since now there appears to be a sheath for the Randall fighter and the 2nd matching knife is included in the listing .