I keep them. Back-ups I leave in the box in storage. Users, well, it's fun looking at the old boxes and comparing the price I paid to the current price. I also like going over the edge-u-cation leaflets.
I've sold a lot of Spydercos and I've never been in a situation where having a box would increase the sale value even just a dollar.
Current carry rotation:
Pacific Salt 2 LC200N | Manix XL M4 DLC | Aqua Salt
Happy to be part of this great forum and group of down to earth spyderco addicts, Thanks Sal and gang. My Grails:Lum Tanto folder sprint, Sprint Persian(red), Captain, Manix 2 (M4), SB MT, PM2 M390, CF dodo, Manix2 (CF S90V),Manix2 XL S90V, ZowadaCF BalanceRassenti Nivarna, Lil' Nilakka, Tuff, Police 4,Chinook 4, Caly HAP4052100 Military, S110V Military, Any/All PM2 & Military sprints/exclusives I can get my grubby hands on
"We may look curious, homely, whatever, but we'll never be called unusable or undependable."
Actually I've got a bigger box collection than I do a knife collection. But I've had help over the years too. I've got Spyderco boxes all the way back to the "black & white" labeled boxes from the early to mid 90s. My original RENEGADE & BLACKHAWK models both came in those types of boxes.
I've got tons of the Gray Spyderco boxes from the early to mid 2000 decade. It gives me a good feeling when I know what came in those boxes from the factory. Long live the Great Spyder Factory
I keep the boxes of all of my knives for resell purposes. This is true of anything really. Anything with value that has a box I will keep. I just threw away a bunch of parts boxes for a rifle because I realized I would never take the effort to take them off my rifle.
Actually some of the boxes from the past maybe going back 15 years plus might even have some collector value to those who own the knives but for whatever reason either lost the original box or never got one when they acquired the knife. I just had a guy not too long ago wonder if I still had a box for the older Renegade model ( pre-2000).
Some of the boxes from the 2000 to 2004 era I'm sure are coveted.