Shame you don't still have access to the previous server/arrangement so that you could auto-generate a list of existing uris before making the move (unless you did that in some other capacity). Basically, thinking of things like EasyPopulate V4 where it is possible to export the store side link for each product which can then be used as necessary to recreate/compare the resulting link in a new environment.
With the loss of the ability to obtain the previous links, it may be difficult to restore such links unless the "method" of link generation is understood/able to be reproduced relatively easily. Ie. Was if it was generated based on the category path/chain to the master category of the product then it is relatively easy. If there were several "home generated" links, then knowing what the link was and to where it pointed will be needed.
Perhaps the above may not be as helpful to you now, but it may help another considering a similar operation or one that still has access to their "old" site before transfer to their new location.
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