How much value does COA & Original Box/Packaging add to collectible value?

The pic may be small by I know all of you would like to have one of these.

 

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You, my friend, have one of the most collectable, most desirable coin sets ever made in the United States. Thank you for sharing it with us.

 

Came to the forum when I found this old thread. I recently picked up a 1903 Mckinley gold dollar along with the original box. Box has the original cheap padding. I have seen only a couple sold with the box included. The coin was nice but the box caught my attention even more!

 

PCGS, NGC, and ANACS does as well. I've got 3 Carson City dates in GSA slabs. I got 2 of the 3 graded, just haven't bothered with the 3rd one yet. Almost all of them end up 63 or 64, it's rare to get one graded higher, and they go for quite a premium. I really don't like the GSA slabs because they are so big, but I'm not getting them cracked out. I keep the boxes and COA separate just in case I decide to sell them.