The specific figures (HK$4.9 million, US$625,800, three months) are not corroborated by the provided web search results. The evidence shows reports of scams involving large sums in Hong Kong (e.g., HK$2 million, HK$160.8m), but none match the exact details of the claim.

The evidence confirms that social media is a common vector for scams, with multiple sources stating scammers use these platforms. However, none of the provided sources specifically confirm that the victim in the claim was *initially contacted* after viewing a post advertising high-return stock investments.

The evidence confirms that scams can involve downloading links or documents (e.g., job opportunities, business projects), but none of the provided sources specifically confirm that the victim was instructed to download an app *via an online messaging service* in the context described.

The evidence contains multiple examples of large-scale financial fraud involving transfers to multiple accounts (e.g., HK$200 million to five different Hong Kong bank accounts; losing around HK$10 million). However, none of the sources corroborate the specific details: 'HK$4.86 million,' 'more than 40 transactions,' or '20 different bank accounts' occurring between 'January and April.'

The evidence confirms the general pattern that victims are initially shown profits and may be able to withdraw small amounts to build trust. However, none of the provided sources confirm that the victim in the claim *eventually lost contact* with the experts and *could not withdraw any funds* after the initial phase.

While the evidence confirms that police reports and scam reporting are common (BBB Scam Tracker, general scam reports), the specific date of 'April 15' and the act of reporting the scam on that exact date cannot be verified across multiple sources. Wikipedia provides general information about the month of April, not specific incident reports.