Opened by Mistake is a 1940 film starring Charles Ruggles and Janice Logan.
Buzz comes up with an idea that Jimmie tell the publisher that intelligence places the banker in Yucatn. The publisher buys this argument and the two buddies leave for Mexico, with a thousand dollars in cash to cover the expenses. They quickly lose most of the money on the track, without even so much as lift their eyes to find the missibg banker.Somehow Kingley sniffs the scam the two men are pulling, and orders Jimmie back to the office immediately. Kingsley plans to meet Jimmie at the boat and disclose the plot. But Jimmie finds out about the plan from Kingsleys secretary, Elizabeth Stiles, and tries to intercept Kingley, flying home with Buzz and then sneaking onto the ship he was supposed to arrive on. Buzz buys a second hand trunk in a riffraff store to look like he has traveled on his own. ........
Source: Wikipedia