Recompense of the Fallen Unique Dog Tag Fist: In the office of Aurelius of Phoenix at Cottonwood Cove, inside his desk.
Oh Baby Unique Super Sledge: It can be found in Charleston Cave, directly north of Jacobstown By a dead Nightkin The Cave is Part of The Quest Guess Who I Saw Today.
Dinner Bell Unique Hunting Shotgun: Complete the Quest Bleed Me Dry To Get This Quest Speak To Red Lucy in The Thorn the Dinner Bell is a Reward for the Quest.
Gobi Campaign scout rifle Unique Sniper Rifle: Locked in a Very Hard Gun Case in The Snipers Nest.
Golden Gloves Unique Boxing Gloves: In the Lucky 38 on The New Vegas Strip Go Up the stairs to the left of the Entrance Go behind the Bar and The Gloves Should be On a shelf.
Love and Hate Unique Spiked Knuckles: In Bonnie Springs Being Held By a Female Viper Gang Leader
Abilene Kid LE BB gun Unique BB Gun: Found in Fields Shack South of Nellis Air Force Base If you have the Wild Wasteland trait, the gun will instead be located inside a well that appears in front of the shack. The well appears after talking to Rex upon him saying "aroo" and asking him if someone fell down a well. Doing this will cause you to receive a map marker denoting the location of Jimmy's Well.
That is All the Locations For Now I will Post more later on Harder to Find Weapons.