Most English strong verbs have become regularized over the years. Some are in transition, and a few seem to be with us for the foreseeable future.
Note: The past and past participle forms of a “regular” verb end in -ed:
walk, walked, (have) walked
marry, married, (have) married
Some English verbs exist with both regular and irregular endings. For example, the verb to dive is heard with both regular and irregular past forms:
The swimmer dived into the water.
The swimmer dove into the water.
Among the verbs that retain their irregular endings are bind, grind, and find. Forming their past forms with -ed is nonstandard.
Here are some examples of incorrect usage of bind and grind found from the Web:
Incorrect: The plastic container and wrap that packaged meat are not removed, but grinded together in giant grinding machines.
Correct : The plastic container and wrap that packaged meat are not removed, but ground together in giant grinding machines.
Incorrect: The way the book is binded does not matter to me.
Correct : The way the book is bound does not matter to me.
Compared to that of writing grinded for ground and binded for bound, the error of writing finded for found is rare. Many of the examples I found were deliberate, intended to represent childish speech or to amuse.
People writing in the persona of a cat are especially fond of this deliberate illiteracy. For example: “Me is Fluffy. When my ownerperson finded me, me hadded fleas.”
Apart from such intentional misuse, I did find some examples that seem to have been used unconsciously. They all occur on gaming sites:
Incorrect: Has anyone else finded the hidden “GEM” secret in crimsonland?
Correct : Has anyone else found the hidden “GEM” secret in crimsonland?
Incorrect: Is it just me, or anyone else finded the silly lost elf?
Correct : Is it just me, or anyone else found the silly lost elf?
In standard usage, books are bound, meat is ground, and what was lost is found.