It is just a letter lah.
The "mysterious" is added to spice it up.
The PMO choose to err on the side of caution.
Whatif syndrome.
DSO now want to play CSI. Check for finger prints, check the
quality of the paper;where distributed; who bought, the print,
trace the typewriter, narrow it down to which retailer, check the
warranty card, who bought the typewriter, check the envelope;
stamps, which post office; view CCTV.
After one week, they can't trace the origin of the letter, but
have one crucial clue.
The sender did put his name, address and NRIC
no, on the letter.
