I remember the Burger King pokeballs. Any chance you can post a picture / possibly PM me, I have to look and see which ones I have which might take some time as they aren't with me, so you can put my pm at the back of the line.
You don't allow PM's from newbies but copy-paste:
http://tinypic.com/r/1zokk0z/9I pulled them out of the pokeballs for ease, the 2 in the middle do have the COA - it's just inside the plastic case.
The pokeball holders themselves due to age started to do that slightly yellow tinge thing on some of them.
But:
Jiggly puff x2 - COA in original plastic sleeve
Charizard x2 - COA in original plastic sleeve
Mewtwo - COA in original plastic sleeve
Mewtwo - COA inside case
Togepi - COA inside case
Edit addition:
Togepi - COA in original plastic sleeve