Investing.com -- Drug wholesaler Pharmsource LLC said Thursday it did not know the Dexcom glucose sensors it purchased from licensed distributors had been marked for destruction, following warnings from the device maker that some units were stolen during disposal and resold.

Dexcom warned users in May that two lots of its G7 continuous glucose monitoring sensors were stolen during a destruction process and later sold by third parties. The company traced some of those sales to Pharmsource.

Brunswick, Georgia-based Pharmsource said it immediately conducted a full audit of its inventory and put remedial measures in place.

"Pharmsource had zero involvement in Dexcom's destruction process, which is where Dexcom reports the theft occurred," a company spokesperson said, adding it would assist authorities in their investigation.

Dexcom said one of the affected lots may carry an increased risk of skin infection, while the other has a higher likelihood of producing no readings.