Call Nintendo with the serial and police report. Without police report, Nintendo won’t flag it. They also cannot locate it.
The Nintendo 3DS may be a legacy console, but its market is hotter than ever. Taking five minutes to look up the serial number can save you from buying a banned console, a stolen unit, or a device that doesn't suit your needs. Nintendo 3ds Serial Number Lookup
Several fan-made sites claim to decode 3DS serials. They generally: Call Nintendo with the serial and police report
She looked down at the 3DS. The blue power light was still blinking, waiting. She typed the master key the website gave her, disabled parental controls, and navigated to the Friends List. a stolen unit