EVERYONE has different experiences in life (ESPECIALLY in CR & even more so on this board it seems). I've been living in CR 9 years in July (as a "Perpetual Tourist" - anxiously awaiting the day CR FINALLY does an amnesty where I WILL IMMEDIATELY file since I don't fall into a category for residency at this point [I'm only 57 years YOUNG!!!]).
I just returned from a WONDERFUL 3 week trip to the Sarasota/Tampa Florida area (damn it's WAYYYYYYYYYYY CHEAPER in Florida than CR on 95% of things!!! LOTS more on that later [I'm already going through withdrawals from the Dollar Trees that have freezer/fridge sections where EVERYTHING TRULY IS $1 or less]).
MY EXPERIENCE TODAY was - I walked up to the VERY NICE (& cute - a nice welcome home!) Immigration guy & he asked when I was leaving CR & I told him in 90 days & he did NOT even ask me for my proof of such & he gave me a 90 day stamp (I like to hold back on giving my proof to them to see if they will ask but I ALWAYS have it!! I had $$ in my bank account in case they demanded I have a plane ticket vs the usual bus ticket that had been working for many before - though here some people were reporting they DEMANDED that proof of departure in 90 days be a plane ticket. Sometimes they ask & sometimes they don't). (FYI - I did ALL my talking in Español!!! [well - more like VicLish!!] BIG GIRL!!)
And at Spirit Air in Tampa (GRRRRR - another story on that later - at least the purchasing nightmare of them) they gladly accepted my ORIGINAL bus ticket as proof I was leaving.
NOTE: Because these days Migracion is often tracking reservations of people that have COPIES of their tickets because some are making bogus tickets - I think it's smart for you to invest the whole fricking $27-$28 to BUY A REAL BUS TICKET!! It's a small investment to have the opportunity to live in CR as freely as we can these days!!!
Just sharin' MY experience!! You might have a different one tomorrow!!!