JB - I'd add the scollops. They were pretty much standard for 502 New Oxford Street long-guns from the time EM created the new label in about December 1847. The two examples of non-scolloped labels above were for pistols, though I have found them for a couple of long-guns as well. You'll have to figure out how to get a large radius punch. I'd also try to get a label in the Khaki color. I've seen labels in green but the Khaki seems standard.
Here are a few on the market - all black on white and therefore not authentic colors. Surely there's a way to tint the background white...quite possibly with tea.
This seller has a period correct Reilly repro which would match your 1868 Reilly gun date: It's a little expensive (4th page at the top)
https://www.cmrfirearms.com/cases-case-trade-labels-vintage-case-trade-labels-1896-1940-p-438.htmlThis one also
https://www.henrykrank.com/catalogsearch/result/?cat=0&q=ReillyThis one as well:
https://www.peterdyson.co.uk/acatalog/E-M-Reilly--NLR--TL182.html#SID=68