An internal investigation revealed that a single employee intentionally concealed these expenses over nearly three years.

Macy’s reported stronger-than-expected sales for the third quarter and said it’s delaying the release of its full quarterly results after it discovered an employee intentionally hid up to $154 million of expenses over several years.

Macy’s delayed its Q3 results after discovering an employee hid $132M-$154M in delivery expenses over three years. Preliminary sales fell 2.4% to $4.74B, below Wall Street estimates, and shares dropped 3.