No. Again text messages are tied to the carrier and your phone number. Texts are basically (YourCellPhoneNumberHere)@(YourCarrier).(CarrierDomain). So if your iPhone had a backup it could pull those old texts into the Messages app. Though carrier keep text for a certain period of time.
Again, you really haven't cleared up how the text or messages were sent? Are they iMessages or text messages?
Yes they file might save the texts but again, it's how iOS is setup to read that file to restore it. The Messages App will only restore texts that are within the carrier time limit and still on their servers, I believe otherwise it will discard importing the text as there is no "reply" for those text.
For iMessages it is sent via a end-to-end messages and will always be able to be saved and restored.
Do you sync your bookmarks with iCloud?
EDIT: Lastly, I was saying play nice because even if someone isn't being the nicest, don't spread the hate. There's no need.