I display my Luke X Wing with an imperial blaster as that's what he had as a child. When I started collecting again I was shocked that this was the wrong weapon. I cannot prove it but I feel my Luke X Wing may have come with an imperial blaster as was quite careful as a kid and wouldn't put him with the wrong weapon.
Saying that, I did end up with an IG88 rifle in my childhood figures box. You may not think that odd, but I never had an IG88 as a kid.
My best friend at the time did as I vividly remember accidentally spinning his IG88's arm off. Unknown to me, the inner part of the arm had stuck tight so while I spun the stiff arm round, I was actually twisting the plastic until it snapped off.
Maybe I deemed a one armed IG88 to not need a 2nd weapon. I was no thief as a kid but this is only place I can imagine it came from.