This shouldn't really adversely affect your decision, but you should know the differences between the old style T/C flint lock and the new style.
Following is a link to a thread with pictures.
https://www.muzzleloadingforum.com/threads/old-style-new-style-t-c-hammer.106053/
Replacing the old style for what is considered to be more reliable ignition with the new style hammer and frizzen is not very expensive.
And of course, with any muzzleloading rifle, check to see if there is anything loaded. Check the bore and look for rust.
@Gum Slough Muzzleloader has a pretty good simplified checklist.