I'm confused

When I bought my Prelude, I found a receipt for a JET chip (cost $300) from what looks like a speed shop. There's no further information. What I gather from searches is there is no JET chip for 5th gen ludes. But you can send your ECU to JET and they reprogram it. What do you make of this little situation here? Is there a way I can tell if something has been done by looking at the ECU?
I appreciate your help.

Call JET, give them the receipt number, and they probably have the work they did on file..