I laughed at 'creating 1400 addresses'. I dont think anyone, whether your a hacker or not, would have that kind of time to sit down and create up to 1400 cryptocurrency addresses and then start moving one Bitcoin to each of them, like youre going to do that up to 1400 times, lol like who will have that kind of time?
By the way, I think if youre creating addresses on the same computer you can still be traced not hundred per cent sure about this though, just saying; but if those addresses are running on the same comp, you will caught. But no one has that time, so they will make use of mixers to escape.
theres wallet that are almost instant or no sign up required . they can used it , sending coin is also quick ( not the process ) but thats not a problem because coins will still arrived soon . by that theyd be able to complete the task within a few hours and lets not forget that they also have friends to the task with them but we forgot that they are hackers . hackers are pretty slick and dont want such hustle , they can think of less stressful ways to cleanse the coins .