As I recall, you are not *required* to use the form, but if you choose to do so, you have to use the $250,000 sign prescribed by the FDIC.
This is a change from the previous guidance, which said, you could *not* display a sign showing the $250,000 amount. All you could do was post a notice next to the sign to explain the temporary increase in coverage.
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"If you want to tell people the truth, make them laugh, otherwise they'll kill you." ~ Oscar Wilde