It appears she or her husband had an associate in organized crime, which took possession of the shipments. Without details it's all speculation on how the products were sold. I'd presume the products were shipped to another region or continent where police were bought off and they could be sold without potential for any investigation.

From the article:

As part of her job, Petrone-Codrington was authorized to make purchases for her department below $10,000.

Beginning in 2013, Petrone-Codrington ordered, or had her staffers order, millions of dollars in of electronics, including Microsoft Surface Pro tablets and iPads, from Yale vendors using the school's funds and arranged to ship the goods to an out-of-state business in exchange for money, which she then pocketed, according to documents.

As part of the scheme, Petrone-Codrington falsely represented on Yale internal forms and in emails that the equipment was for Yale Med needs, such as medical studies.

To cover up her crimes, Petrone-Codrington broke up the fraudulent purchases into orders below the $10,000 threshold that would require additional approval.

The out-of-state business, which resold the electronic equipment to customers, paid Petrone-Codrington by wiring funds into an account for Maziv Entertainment, a photography and video production company co-owned by her husband, in which she is listed as a principal.