Over the last seven weeks an anonymous benefactor has given out five envelopes full of cash to communities groups in Redford, Michigan.

Envelopes containing $1000, in ten crisp hundred-dollar bills, were mailed to the local library, the Tail-waggers Animal Clinic, a civic group, a credit union and to the Goodfellows, an organization that donates holiday meals and gifts to needy families.

The one clue that ties all letters together, written on each – four digits, 1679.

But no one can figure out what the numbers mean. They do know the donations mean a lot in the Detroit suburb where 20,000 households could be served by such generosity.

(WATCH the video above from WJBK-2 Detroit)

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