Thanks for weighing in Everyone
This answer gives me the way to do what I wanted...

You are right, I had cut and pasted the wrong hashref for my final example
What I was really looking for was a way to explore deep-down in the guts of just one of the grep results

Putting the paren around the output of grep lets me index into the grep results
and then I can even go deeper into the data structure from there

 x 2 (grep {$_->{CHIPS_PART_NAME}=~/gravity/i} @goodRefDes)[4]
0  HASH(0xe0b0f3c)
   'CDS_LIB' => 'contactor'
   'CDS_LMAN_SYM_OUTLINE' => '-150,1400,150,-1400'
   'CDS_LOCATION' => 'SITE1_19'
   'CDS_PART_NAME' => 'GRAVITY_DIL_DUT_56_DGV_CONTACTOR-56P-FULL-GRAVI
+TY_DIL_DUT_56_DGV'
   'CDS_PHYS_PART_NAME' => 'GRAVITY_DIL_DUT_56_DGV_CONTACTOR-56P-FULL-
+GRAVITY_DIL_DUT_56_DGV'
   'CDS_SEC' => 1
   'CHIPS_PART_NAME' => 'GRAVITY_DIL_DUT_56_DGV'
   'DCF_ID' => 'SITE1_19'
   'DESCRIPTION' => 'DUT, DIL, DGV, 56-PIN'
   'DESIGN_BLK_INFO' => HASH(0xe0ad774)
   'HPATH_INFO_LIST' => ARRAY(0xe0b1944)
   'LOCATION' => 'SITE1_19'
   'PACK_TYPE' => 'CONTACTOR-56P-FULL'
   'PART_NUMBER' => 'GRAVITY_DIL_DUT_56_DGV'
   'PHYS_PAGE' => 1
   'PIN_LIST' => ARRAY(0xe0b16d4)
   'PROP_INFO' => HASH(0xe0b15e4)
   'RAW_HPATH' => '@\\6632725_lib\\.\\6632725\\(sch_1):page72_i6@\\663
+2725_lib\\.locustsite(sch_1):page1_i2'
   'ROT' => 0
   'SEC' => 1
   'VER' => 2
   'XY' => '(-4850,2200)'
[download]

 x 2 (grep {$_->{CHIPS_PART_NAME}=~/gravity/i} @goodRefDes)[4]->{PIN_L
+IST}[0]
0  HASH(0xe0b1b54)
   'ALT_NAME' => 'SITE1_19.1'
   'PIN_NAME' => '\\1\\'
   'PN' => 1
[download]