The paramedic response bag disappeared from the vehicle while the emergency crew was attending to a patient at Logan Street, Blantyre, in South Lanarkshire, shortly after 1pm on Boxing Day.
The bag was discovered at 10am yesterday in the garden of a house in Anford Place in Blantyre, and handed in to police.
But drugs including intravenous diazepam, adrenaline, atropine, amiodrone, and GTN, also known as nitroglycerine were missing.
Sergeant Mark Stirling said: "I would warn any member of public not to take any of these medicines as they should only ever be given under medical supervision."
Anyone who can help can call 01698 202500.