The contents of an envelope can vary greatly depending on the context. Without further information, it is impossible to know exactly what a specific envelope held. Envelopes are commonly used to contain:

• Letters: Written correspondence is a frequent use.
• Documents: Important papers, like contracts or certificates.
• Photographs: Pictures for personal or professional use.
• Cards: Greeting cards for various occasions.
• Money or checks: Financial instruments for payment.
• Small objects: Items like keys or tickets.

To determine the specific contents of an envelope, additional details are required.