Usually, “Failed attempt” means that the package was trying to be delivered to you by your post office but failed (for example, you were out of the home). After that, the package stays at the post office for some days, usually up to 2 weeks. You need to go to your post office and receive it.
Some post offices in the United States require a signature from you even if we do not request it (we even don’t have this option). So, you should go to the post office to receive your package.
Please go to the post office as soon as you receive the notification because your package may be returned to us.