New Clues New Place

These two postcards were found taped to agent Alex Desmond's computer screen this morning when he arrived to work. Combined, the message reads as follows:
There is a museum in Death Valley
Where a woman by the name of Sally
Has a steampunk watch that can travel one through time
Tell her you were sent 
By an anonymous gent
Then hand her an 1888 dime.
When she hands you the timepiece 
Fly like a flock of geese
And never return to that Death Valley Museum again.