jingle mail n. building or house keys sent by mail and unexpectedly received by a mortgage-issuer from someone who can no longer make mortgage payments and chooses to relinquish control of a property. (source: Double-Tongued Dictionary)
Further reading
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While reading Great Expectations (Bookshop|Amazon) by Charles Dickens, a listener in Arlington, Texas, is surprised when one of the characters inherits some money, which Dickens describes as a cool four thousand. Were they really using cool that way...
The phrase “jingle mail” appeared in the New York Times of 5/10/08, p. B1, in an article entitled “Mortgage Holders Find It Hard to Walk Away From Their Homes.”
URL http://www.nytimes.com/2008/05/10/business/10housing.html?em&ex=1210564800&en=df014084fed21ba5&ei=5087