?action=history and the individual diff views on UserBox: pages display "(undo)" links as per usual, but these links are essentially non-functional, given that ?action=edit on a UserBox: page redirects to Special:UserBoxes with the appropriate id (FanBox ID, if I recall correctly, not the page_id from the page table!) URL parameter prefilled, and that's pretty much it; undo and undoafter parameters, for example, are simply lost due to the redirection. (This is largely because FanBoxes was developed and, to a large extent, finalized well before MediaWiki 1.10 (!) and the ability to undo edits via the page history/diff view "(undo)" link is a more recent MW core feature.)
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Change #1046740 had a related patch set uploaded (by Jack Phoenix; author: Jack Phoenix):
[mediawiki/extensions/FanBoxes@master] Hide (undo) links on page histories and individual diff views because undo is not yet supported on backend level
Change #1046740 merged by jenkins-bot:
[mediawiki/extensions/FanBoxes@master] Hide (undo) links on page histories and individual diff views because undo is not yet supported on backend level
Change #1055153 had a related patch set uploaded (by Jack Phoenix; author: Jack Phoenix):
[mediawiki/extensions/FanBoxes@master] Major architectural overhauling related to editing and viewing of old revisions of UserBox: pages
Change #1055153 merged by jenkins-bot:
[mediawiki/extensions/FanBoxes@master] Major architectural overhauling related to editing and viewing of old revisions of UserBox: pages