If I have a Laserfiche briefcase file, is there any way to see what the original (source) IDs were for the files inside it?

I know when importing the briefcase, the documents are treated as new documents and take a new ID. I was just wondering if that data was stored in the briefcase and was able to be extracted somehow.

My issue is this: sometimes I get a briefcase file from another Laserfiche system I don't have access to. Accompanying it is an index that lists out what the files are and has a reference to the LF ID of the inaccessible system. I want to be able to easily know what line on the index matches up to what document I'm importing.

Thanks.