Walmart sales records become critical evidence as FBI investigates Nancy Guthrie's disappearance

Authorities have not publicly detailed how many of the backpacks were sold or over what timeframe they are focusing, but the approach reflects a standard federal investigative technique. Fox News Digital has reached out to Walmart Corp. for additional information.

Likening the purchase history analysis used in the conviction of Brian Cole Jr., who planted two live pipe bombs outside the Democratic National Committee and the Republican National Committee, Nantz said Cole's arrest came after investigators developed critical evidence from his purchase history.

Large retailers maintain SKU-level sales records that capture the date, time and location of each purchase, along with payment method information. 

By isolating sales within a defined window, agents can create a list of purchasers and then prioritize leads based on physical descriptors.

Pack said retail forensics can be decisive when combined with other evidence.

Jan. 31, 2026

Between 9:30-9:45 p.m. - Family drops Nancy off at home

9:50 p.m. - Garage door closes (per authorities)

Feb. 1, 2026

1:47 a.m. - Doorbell camera disconnects

2:28 a.m. - Pacemaker disconnects from phone application

12:03 p.m. - 911 called

12:15 p.m. - Sheriff's deputies arrive at home