The signed current version, with any superseded draft kept and labelled rather than discarded. Include the executed lease and amendments, supplier agreements and invoices, proof of payments leaving the investor's account, incorporation and share records, and the plan rewritten to match them. Keep a short index showing dates and who holds the original.
Label the drafts instead of deleting them
Destroying earlier versions looks tidy and creates a worse problem, because copies usually survive with the landlord, the broker or the bank. Mark each superseded document as replaced, give the reason in one line, and point to the version that governs. Where a translation or a certified copy is missing, list it as an outstanding item with a person and a date attached.
An index of that kind also tells the investor what is genuinely still unresolved. Give the index a column for who physically holds each original, since that is the information most often needed and least often recorded. A lease sits with the landlord's agent, incorporation documents with a registered office, payment confirmations with a bank, and the investor may hold only copies.
When a certified copy or a translation is wanted at short notice, that column is what makes it obtainable. Add a second column for anything with an expiry date, because certificates, police records and some corporate extracts age and a file assembled too far in advance can contain items that are no longer current when they are finally used.