Lesson Learnt: never quote a job without inspecting every single file with every single details -_-

[clarification in comments]

I do design work.
A client purchased an entire stationary pack from envato's GraphicRiver.net site. It has about 30 items in it. I took a look at a couple of the items and saw they were basic templates like business cards and brochures. Afterwards I gave in my usual quote that I charge . Little did I realize that there where some big 20-40 page books inside that I had to work on too! :/ Now I'm not sure how to charge this client for those (he might think Im an ass for charging extra)

But what did the client ask for? Surely he didn't give you the pack of files and say "this." Right?

If he asked for stationery then that's what you priced and what he gets.

If he asked for stationery plus literature you wouldn't have priced so low.

There's a lot of work in books ffs, does he even have content? Who's the editor?

There's many reasons not to just do this without renegotiating the price or refusing the literature.

Actually, I am working with Envato Studio and we have this service where clients buy templates from any Envato Site and if the client needs, they purchase a service that will add content the client provides. I am part of that service
When an item is beyond the scope of the service, we bring in custom quotes. Thats what happened here. The custom quote is pretty high. However the stationary pck contained some InDesign files I overlooked when coming up with a cost.

Ack! The small print strikes again 🤔

@pixeltherapy exactly! Haha.