How to find data sheet to LED Display?
Ignoring non-constructiveness of the question, I would like to answer it as community is becoming lenient. This conclusion is just by looking at other answers.

It seems that this invoice is from Sparkfun.

Easiest way to figure out what is what is to call /contact them. You should also leave them a feedback so that novices like yourself don't have to face such issue.

I usually buy from Mouser and Digikey and each part is package labeled.

Example below: