Wellington County OPP are investigating two vehicle break-ins that occurred on the same day in the Fergus area.
They say the break-ins occurred on Dec. 9.
Investigators say credit cards and personal identification were stolen.
They later determined that one of the stolen credit cards was used to make a purchase at a convenience store in Guelph.
Investigators want to speak to a person who was seen on security video where the card was allegedly used.
They also believe the person may have been driving a dark-coloured vehicle.
Anyone with information can contact Wellington County OPP at 1-888-310-1122 or Crime Stoppers at 1-800-222-8477.