How do I retrieve all deleted messages from my Panasonic KX-TG5240?

SOURCE: manual for panasonic kx-tg5240

Here's the manual (Adobe PDF) from Panasoni's site:

http://service.us.panasonic.com/OPERMANPDF/KXTG5240.PDF

SOURCE: retrieving messages over phone

Using the answering system
remotely
1 Dial your phone number from a touch
tone phone.
2 After the greeting message starts, enter
your remote code The default setting is “11”..
LThe unit plays back new messages
including memo messages.
LAfter playing back new messages,
the voice guidance starts.
3 Follow the voice guidance as
necessary.
4 When finished, hang up.

Voice guidance
During remote operation, the unit’s voice
guidance prompts you to press {1} to
perform a specific operation, or press {2}
to listen to more available operations.
Operations are presented by voice
guidance in the following order:
– Play back all messages
– Play back new messages
– Record your message
– Erase all messages
– Record your greeting message
Note:
LIf you do not press any dial keys within
10 seconds after a voice guidance
prompt, the unit disconnects your call.
LIf less than 10 minutes of recording time
is available, the unit announces the
remaining recording time after the last
message is played back.

Remote commands
You can select the desired line(s) and
press dial keys to access certain
answering system functions without
waiting for the voice guidance to prompt
you.
1 Select the desired line(s) while you are
accessing the answering system if
necessary.
For line 1: {#}{1}
For line 2: {#}{2}
For line 1 and line 2: {#}{0}
LAfter selecting the line(s), memo
messages do not play.
2 Press the desired dial keys.

Key Remote command
{1} Repeat message (during
playback).*1
{2} Skip message (during
playback).
{4} Play new messages.
{5} Play all messages.
{9} Stop recording/
playback.*2
{0} Turn answering system
off.
{*}{4} Erase currently playing
message.
{*}{5} Erase all messages.
{#}{1}{7} Record a greeting
message for line 1 only.
{#}{2}{7} Record a greeting
message for line 2 only.
{#}{0}{7} Record a common
greeting message for both
line 1 and line 2.
{#}{1}{8} Turn answering system
on for line 1 only.
{#}{2}{8} Turn answering system
on for line 2 only.
{#}{0}{8} Turn answering system
on for both line 1 and line 2

*1 If pressed within the first 5 seconds of a
message, the previous message is
played.
*2 To resume operation, enter a remote
command within 15 seconds, or the
voice guidance starts.

Turning on the answering system
remotely
If the answering system is off, you can turn
it on remotely by calling the selected line in
“Turning the answering system on” on
page 40.
1 Dial your phone number.
2 Let the phone ring 15 times.
LThe unit answers your call with the
greeting message.
LYou can hang up, or if you call from a
touch tone phone, you can enter your
remote code and begin remote
operation