Sigma DP1

I do not have a DP1, but some digital cameras store the information on the photo itself. Try running exiftool on a photo and check the output carefully. If not, then I'm afraid I have no idea.
 
Many digitals use a sequential file numbering system until 9999, then start over. There is usually an option to reset the numbering each time the storage card is removed.

This might be a guide, although there is no way to know absolutely.
 
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