Some people hide money under their mattress but not usually this much.

FOX's Lilian Woo reports: 

Federal authorities finding about $20 million in cash hidden in a box spring in a Massachusetts apartment, part of an investigation into an internet telecom company prosecutors say was actually a massive pyramid scheme.

The apartment was seized after a Brazilian man was arrested for the laundering money linked to what authorities call a multi billion dollar global fraud.

Authorities say Telexfree had few customers and made most of its revenue from people buying into the company and swindled almost a million people around the world out of nearly $2 billion.

Lilian Woo, FOX News.

Follow Lilian Woo on Twitter: @LilianNY