What must I do after taking money from the cash register without anyone's knowledge and swearing an oath that I did not take the money, with the intention of returning it, for fear of scandal?

The questioner has committed two grave sins: taking the company's money unjustly and betraying a trust, and swearing by Allah falsely that he did not take the money, which is a perfidious oath. His intention to return the money in the future will not benefit him, nor will dissimulation be effective in this oath. What is incumbent upon him is to repent and return the money to its owner by any possible means without causing a scandal; for his conscience will not be cleared except by doing so.