Could you explain from where you are getting this? Q1 letter doesn't say that M3 deposits were part of customer deposit figure. It only says, it was included in receivables.
I think, the problem is your assumption that 150k M3 deposits are counted in Q1. Q1 letter says "almost all model 3 deposits on the last day of Q1 are in accounts receivables", so it is likely that only the $115M is what's counted as M3 deposits for Q1 (end of day PST instead of midnight?). Here, I'm assuming your quote of "36% of $318M" from sec filing is correct, which I believe it is.
So, if we drop the less certain 150k M3 reservations counted for Q1, then the numbers can start making sense. If we also assume that M3 deposits weren't part of Q1 customer deposits, then the deposit numbers start meaning something.
Q1 customer deposits = $391.3M
Q2 customer deposits = $679.8M ( if $373M increase is due to M3, then the MS+MX deposits dropped by $85M)
During Q1 ER Q&A call, it was said by Jason W. that because 3/31 reservations were done by credit card, they were not transferred funds until the next day (4/1) so couldn't be counted as a true deposit. mmd's info here is about right. Now, since Customer Deposits include paid for cars as well as the cash deposit ($110K versus $5K) the more cars in transit, the higher Customer Deposits can appear. If there were 1000 Model X Sigs in transit at end of Q1, many or most paid for by eager customers - that is $130M alone. 2000 MS ASP $90K would be $180M. Add in 2150 others not yet paid for.
In order to keep Customer Deposits showing up as large numbers, you want as many as possible of paid-for cars in-transit at the end of a quarter. Read TMC posts about guys getting asked to pay for cars before they show up at sales and service centers. Realistically, they should be paid for on the day of delivery but many are presented with payment requests much sooner. And don't forget Texas buyers (and other states) are required to pay in full before shipping from the factory. I recently bought a car elsewhere from a dealership and paid for it 3 days after delivery. Took it home with no money down, wrote a check and had them deposit it 3 days later. Very disruptive.
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