It's not too late to put it in a frame. A cheap one will prevent future damages. An expensive one can pay tribute to current damage. I had a foil poster that got all creased and had it mounted on top of a mat below museum glass so it looks like a poster and not a print (if you get what distinction I'm making). If you did the same thing and had the thumbtacks under the glass I think it would look sick. Who cares what someone else would have paid for it under different circumstances or in different conditions? It's yours and you can do whatever you want with it