If an individual finds themselves in a situation where their Economic Stimulus Payment Rebate check is lost or stolen, there are specific steps to take. First, it is important to check the status of the payment using the relevant online tools provided by the Internal Revenue Service, which will allow individuals to verify whether the check was issued and if it has been cashed. If the check is confirmed as lost or stolen, the next step is to notify the Internal Revenue Service for further instructions. This may involve completing a Form 3911, which is the Taxpayer Statement Regarding Refund. The IRS may also require the individual to wait a certain period, typically up to a few weeks, before processing a replacement check to ensure that the previous one is indeed uncashed or void. Additionally, it is crucial to take steps to safeguard personal information to prevent identity theft. For detailed guidance, individuals might want to refer to the relevant sections on the IRS website or review the latest information on this topic.