Hello @Merry153 Hearty Welcome to the Farm Heroes section of our friendly King Community
To answer your question about the Piggy Bank, I am sure it should increase the count of Gold Bars too!! But, unfortunately, I do not have this feature in my game, hence, cannot give you specific details
Hence, I will tag our Farm Community Manager @QueenB to pitch in and help you out But, all the Community Team have gone home now as they are located overseas! Can I request you to please wait till tomorrow to get an accurate response?
Thank you very much for understanding and your patience!
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The level on the Piggybank is a new feature that is being tested and, it basically upgrades the look of the Piggybank. I don't change the price nor the number of Gold bars it can hold.