But it also means transfer of more equity from founders to investors, as investment terms these days typically include equity transfers if an IPO falls short of private valuations
would like to see more evidence and proof those numbers are credible...
Dropbox's numbers are in their S1 filing and Box's in their financials already linked. Are you questioning the legitimacy of these filings?
Unhappily it's common to find that S1 financial claims are overstated after the fact, it's a part of making ipo prospects as positive as possible.