How can I see all my DM on Twitter?

[Iratealarm825]

Hello
I have a question.

On my Direct Message page on Twitter I can see only the past 100 messages I exchange with someone.
How can I see all my Direct Messages? I didn't delete any of them.
It's important because my boyfriend send me the booking code for my next flight in a Direct Message on Twitter but now I can't see it and I need it to check some informations.
How can I see all the Direct Messages I recieve in the past few months?

Thank you

[Spagett]

i dont know i only have like 2 DMs, ever.